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Cystic fibrosis is an autosomal recessive condition. In a population, 0.04% of individuals have the disease. Use the Hardy-Weinberg equation to calculate the number of carriers of cystic fibrosis.

Autosomal recessive means that 2 copies of a allele are required for the phenotype. The phenotype is the set of observable characteristics due to the genotype. In this case the phenotype is whether an indivi...
CN
Answered by Caitlin N. • Biology tutor
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If Q = P / (R (4 – t)), calculate the value of Q when P = 36, R = 3 and t = –2

So seeing as you are given the values for P, R and t, the first thing you need to do is substitute the letters for their given numbers into the equation: Q = (36) / ((3) (4 - (-2)) Now expand out the bracket...
RB
Answered by Rosie B. • Maths tutor
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Write x/(x-1) - x/(x+1) as a single fraction in its simplest form (Edexcel GCSE 2016)

The key concept to answering this question is to notice that you need a common denominator for both fractions in order to subtract and simplify them. Clearly the two denominators: (x-1) and (x+1) are not the...
FK
Answered by Fritz K. • Maths tutor
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1/7 + 5/3x

1 x 3x / 7 x 3x + 5 x7 / 3x /7 = 3x/21x + 35/21x = 3x + 35 / 21x
RC
Answered by Rachel C. • Maths tutor
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4x^2+5x+2=10

x=0.921 x=-2.17
CK
Answered by Charles K. • Maths tutor
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